The family threw an extremely lavish bash on Saturday in Farmington, Gloucestershire, in the exclusive Cotswolds countryside. The celebration marked the "coming of age" for the Princess, as well as the Prince's 50th birthday which took place in May.

Naturally, it was attended by hoards of aristocracy and royalty.

The dress code was to "revolutionize your black tie," and fortunately the guests did not disappoint. They shared their experiences at the party using the hashtag #5021revolution on Instagram.

Scroll down for a sneak peek inside one of the most exclusive and extravagant high society parties of the year.

Princess Olympia, the eldest daughter of Pavlos, Crown Prince of Greece and Marie-Chantal, Crown Princess of Greece, celebrated her 21st birthday at a bash in the exclusive Cotswolds countryside on Saturday.

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She wore a spiky crown adorned with flowers, and a Steven Khalil studded and embellished dress which had a long nude tulle skirt. She finished her edgy look with a pair of platform Gucci trainers.